General Free WiFi calling from abroad?

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I'll be traveling to Costa Rica and I don't want to get an international plan for my note 4 (att). The resort has wifi I can connect to. What are my options for making calls back to the US while there?

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Jan 28, 2011

Hangouts + Hangouts Dialer works pretty well and is free for calls to/from the USA but:
1) Your outbound calls will come "from" your Google Voice number, and some people refuse to pick up calls from unrecognized phone numbers.
2) Anybody wanting to call you would have to call your Google Voice number.

I don't know about AT&T, but Sprint has free "WiFi Calling" built into all of their reasonably-modern phones. ("WiFi Calling" can be turned on from the settings menu of my Sprint Samsung Galaxy S5.) With Sprint, WiFi calling to/from US numbers is free, and uses your cell phone number. You may want to see if AT&T has free WiFi calling.